/* 		MD5 C code				*/
/*              2013.7.2                                */
/*              FILE_NUM 10                             */
/*              FILE_MAX_LEN 1000                       */

#include<stdio.h>
#include<string.h>
#include<time.h>

//#include "nku2.h"

#define FILE_NUM 1
#define FILE_MAX_LEN 1000
#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21

#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))

/* ROTATE_LEFT rotates x left n bits.
 */
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
#define FF(a, b, c, d, x, s, ac) { \
 (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }
#define GG(a, b, c, d, x, s, ac) { \
 (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }
#define HH(a, b, c, d, x, s, ac) { \
 (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }
#define II(a, b, c, d, x, s, ac) { \
 (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }

typedef unsigned int UINT4;
typedef unsigned char *POINTER;
typedef struct 
{
  UINT4 state[4];                                   /* state (ABCD) */
  UINT4 count[2];        /* number of bits, modulo 2^64 (lsb first) */
  unsigned char buffer[64];                         /* input buffer */
} MD5_CTX;

void MD5Init (MD5_CTX *);
void MD5Update (MD5_CTX *, unsigned char *, unsigned int, unsigned char *);
void MD5Final (unsigned char [16], MD5_CTX *, unsigned char *);
static void MD5Transform (UINT4 [4], unsigned char [64], unsigned char *);
static void Encode (unsigned char *, UINT4 *, unsigned int);
static void Decode (UINT4 *, unsigned char *, unsigned int);
static void MD5_memcpy (POINTER, POINTER, unsigned int);
static void MD5_memset (POINTER, int, unsigned int);

static unsigned char PADDING[64] = {
  0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};

void MD5Init (context)
MD5_CTX *context;                                        /* context */
{
  context->count[0] = context->count[1] = 0;
  context->state[0] = 0x67452301;
  context->state[1] = 0xefcdab89;
  context->state[2] = 0x98badcfe;
  context->state[3] = 0x10325476;
}

void MD5Update (context, input, inputLen, file)
MD5_CTX *context;                                        /* context */
unsigned char *input;                                /* input block */
unsigned int inputLen;                     /* length of input block */
unsigned char *file;
{
  unsigned int i, index, partLen;
  index = (unsigned int)((context->count[0] >> 3) & 0x3F);
  if ((context->count[0] += ((UINT4)inputLen << 3)) < ((UINT4)inputLen << 3))
  	context->count[1]++;
  context->count[1] += ((UINT4)inputLen >> 29);
  partLen = 64 - index;
  if (inputLen >= partLen) {
  	MD5_memcpy ((POINTER)&context->buffer[index], (POINTER)input, partLen);
  	MD5Transform (context->state, context->buffer,file);
  for (i = partLen; i + 63 < inputLen; i += 64)
   	MD5Transform (context->state, &input[i],file);
  index = 0;
  }
  else
  	i = 0;
  MD5_memcpy ((POINTER)&context->buffer[index], (POINTER)&input[i], inputLen-i);
}


void MD5Final (digest, context, file)
unsigned char digest[16];                         /* message digest */
MD5_CTX *context;                                       /* context */
unsigned char *file;
{
  unsigned char bits[8];
  unsigned int index, padLen;
  Encode (bits, context->count, 8);
  index = (unsigned int)((context->count[0] >> 3) & 0x3f);
  padLen = (index < 56) ? (56 - index) : (120 - index);
  MD5Update (context, PADDING, padLen,file);
  MD5Update (context, bits, 8, file);
  Encode (digest, context->state, 16);
  MD5_memset ((POINTER)context, 0, sizeof (*context));
}

static void MD5Transform (state, block, file)
UINT4 state[4];
unsigned char block[64];
unsigned char *file;
{
  UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
  Decode (x, block, 64);
  int i;
  //for(i=0;i<16;i++)
  //	printf("x[%d]=%08x\n",i,x[i]);
  unsigned int *tp = x;
  FILE *fp;
  fp=fopen(file,"a");
  for(i=0;i<16;i++)
  {
    	fprintf(fp,"%02x\n",(x[i]<<24)>>24);
    	fprintf(fp,"%02x\n",(x[i]<<16)>>24);
    	fprintf(fp,"%02x\n",(x[i]<<8)>>24);
    	fprintf(fp,"%02x\n",x[i]>>24);
    	printf("0x%02x",x[i]>>24);
    	printf("%02x",(x[i]<<8)>>24);
    	printf("%02x",(x[i]<<16)>>24);
     	printf("%02x,\n",(x[i]<<24)>>24);
  }
  fclose(fp);

  /* Round 1 */
  FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
  FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
  FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
  FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
  FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
  FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
  FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
  FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
  FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
  FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
  FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
  FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
  FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
  FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
  FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
  FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */

 /* Round 2 */
  GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
  GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
  GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
  GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
  GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
  GG (d, a, b, c, x[10], S22,  0x2441453); /* 22 */
  GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
  GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
  GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
  GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
  GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
  GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
  GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
  GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
  GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
  GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */

  /* Round 3 */
  HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
  HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
  HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
  HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
  HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
  HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
  HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
  HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
  HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
  HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
  HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
  HH (b, c, d, a, x[ 6], S34,  0x4881d05); /* 44 */
  HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
  HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
  HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
  HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
  /* Round 4 */
  II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
  II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
  II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
  II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
  II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
  II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
  II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
  II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
  II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
  II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
  II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
  II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
  II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
  II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
  II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
  II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */

  state[0] += a;
  state[1] += b;
  state[2] += c;
  state[3] += d;
  MD5_memset ((POINTER)x, 0, sizeof (x));
}
static void Encode (output, input, len)
unsigned char *output;
UINT4 *input;
unsigned int len;
{
  unsigned int i, j;
  for (i = 0, j = 0; j < len; i++, j += 4) {
  	output[j] = (unsigned char)(input[i] & 0xff);
  	output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
  	output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
  	output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
  }
}

static void Decode (output, input, len)
UINT4 *output;
unsigned char *input;
unsigned int len;
{
  unsigned int i, j;
  for (i = 0, j = 0; j < len; i++, j += 4)
  	output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) | (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
}


static void MD5_memcpy (output, input, len)
POINTER output;
POINTER input;
unsigned int len;
{
  unsigned int i;
  for (i = 0; i < len; i++)
  	output[i] = input[i];
}

static void MD5_memset (output, value, len)
POINTER output;
int value;
unsigned int len;
{
  unsigned int i;
  for (i = 0; i < len; i++)
  	((char *)output)[i] = (char)value;
}

int do_md5()
{
  int i,j,k;
  unsigned int r;
  unsigned int string_length, len, len0;
  char len_addr[] = "@00000000";
  char pad_addr[] = "@00000004";
  char md5_addr[] = "@08000000";
  char file_name[32];
  unsigned char digest[16];
  unsigned int RAND_SEED = 126 ;
  srand( RAND_SEED );
  for( i=0; i<FILE_NUM; i++)
  {
	if ( (i%10) == 0 ){
		RAND_SEED ++;
		printf("RAND_SEED = %d\n",RAND_SEED);
                srand ( RAND_SEED ) ;
        }
  	//string_length = rand()% (FILE_MAX_LEN+1);
	//string_length = 503;
	//string_length = 55;
	string_length = 248;
	//string_length = 119;
	
  	unsigned char string[string_length];
	sprintf( file_name, "./hex_md5/md5_file%04d.hex", i);
        printf ("file_name: %s\n", file_name);

	FILE *fp;
  	fp=fopen (file_name, "w");
  	//fprintf (fp, "%s\n", len_addr);
 
 	/*	random int to string	*/
#if 1
  	for (j=0; j<string_length; j++)
  	{
  		r = rand() & 0xff;
  		//printf ("r=%d\n", r);
  		string[j] = (char) r;
  	}	
#else
	for (j=0; j<string_length; j++){
		unsigned int t = nku1[j/4];
		//printf("t 0x%08x", t);
		int mmod = j % 4;
		//printf("mmod %d\n", mmod);
		if (mmod == 0){
			r = t & 0xFF;
		}else if (mmod == 1){
			r = (t >> 8) & 0xFF;
		}else if (mmod == 2){
			r = (t >> 16) & 0xFF;
		}else if (mmod == 3){
			r = (t >> 24) & 0xFF;
		}
		//printf("r 0x%02x\n", r);
		string[j] = (char)r;
	}
#endif

#if 0
	unsigned int *tp = string;
	memset(tp, 0, 64);
	tp[0] = 0x80636261;
	tp[14] = 0x18;
#endif
 	string[string_length] = '\0';
 	//printf("string=%s\n", string);
 	printf("string_length(byte)=%d\n",string_length);
	
	len0 = ((string_length)%64) > 55;
 	len = (((string_length)/64)+1+len0)*64;
 	fprintf (fp, "%s\n", pad_addr);
	fclose(fp);
 	MD5_CTX context;
 	MD5Init (&context);
 	MD5Update (&context, string, string_length, file_name);
 	MD5Final (digest, &context, file_name);
 	printf ("After encryption:\n");
 	for(j=0; j<16; j++)
 	printf ("%02x", digest[j]);
 	printf ("\n\n");

 	fp = fopen (file_name, "a");
 	fprintf (fp, "%s\n", md5_addr);
 	for (j=0; j<13; j=j+4)
 	{
   		for (k=3; k>=0; k--)
   		fprintf (fp, "%02x\n", digest[j+k]);
 	}
	fprintf (fp, "%s\n", len_addr);
	fprintf (fp, "%02x\n", (len<<24)>>24);
        fprintf (fp, "%02x\n", (len<<16)>>24);
        fprintf (fp, "%02x\n", (len<<8)>>24);
        fprintf (fp, "%02x\n", len>>24);
 	fclose (fp);
 }
 return 0;
}


